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Ornamental Plumage Coloration Interacts with Habitat Urbanization to Predict Problem-Solving in the House Finch Haemorhous mexicanus 观赏羽色与生境城市化的相互作用预测墨西哥HaemorhousFinch的问题解决
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-08-20 DOI: 10.3161/00016454AO2021.56.1.003
S. Arnold, M. Weaver, K. McGraw
Abstract. Urbanization presents wildlife with many novel environmental challenges and opportunities, including navigating new physical structures and exploiting unique food bases. Thus, animal species that persist or thrive in urban environments may have superior cognitive abilities that allow them to navigate and solve anthropogenic problems. Prior studies have shown neural and behavioral differences between animals inhabiting urban and rural environments, but few have tested cognition-related behavioral responses of animals in an urban context. We administered a novel foraging challenge to caged male House Finches Haemorhous mexicanus — a successful urban and native desert species in the southwestern United States — captured from two urban and two rural locations to examine population differences in problem solving. This task involved opening a tin lid that was slid over the bird's normal small food dish and left only slightly ajar (with no food visible). Male House Finches display exaggerated, sexually selected plumage color that is dependent on diet, so we also tested the hypothesis that more colorful males can better solve foraging problems. We found no differences in problem solving success between urban and rural birds. However, among rural birds, we found that redder males were more likely to solve the foraging task than less-red males. Also, birds that lost more mass during the study were more likely to solve the task, but this was only true among less colorful birds. Our results are consistent with the hypothesis that plumage redness reveals foraging skill in House Finches found in their native environment.
摘要城市化给野生动物带来了许多新的环境挑战和机遇,包括适应新的物理结构和开发独特的食物基础。因此,在城市环境中生存或繁衍的动物物种可能具有优越的认知能力,使它们能够导航并解决人为问题。先前的研究表明,生活在城市和农村环境中的动物在神经和行为上存在差异,但很少有研究测试城市环境中动物的认知相关行为反应。我们对笼养的雄性家雀(Haemorhous mexicanus)进行了一项新的觅食挑战,这是美国西南部一种成功的城市和原生沙漠物种,分别从两个城市和两个农村地区捕获,以检查种群在解决问题方面的差异。这项任务包括打开一个锡盖,这个锡盖盖在鸟类正常的小食物盘上,只留下一点点半开(看不到食物)。雄性家雀表现出夸张的、性别选择的羽毛颜色,这取决于饮食,所以我们也测试了一个假设,即颜色越鲜艳的雄性越能更好地解决觅食问题。我们发现城市鸟类和农村鸟类在解决问题的成功率上没有差异。然而,在农村鸟类中,我们发现红色的雄性比红色较少的雄性更有可能完成觅食任务。此外,在研究过程中失去更多质量的鸟类更有可能完成任务,但这只适用于颜色不那么鲜艳的鸟类。我们的研究结果与假设是一致的,即羽毛的红色表明了在其原生环境中发现的家雀的觅食技能。
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引用次数: 0
Allometry of Egg Size as a Factor Influencing Egg Shape in Birds 蛋大小异速发育对鸟类蛋形的影响
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-08-20 DOI: 10.3161/00016454AO2021.56.1.007
I. Mytiai, O. V. Shatkovska, M. Ghazali
Abstract. Despite a huge diversity of egg shapes among birds, similar egg shapes occur in species that differ in habitats and are not phylogenetically closely related; this indicates the presence of factors limiting the egg shape variability. We assume that one of these factors is a general pattern of egg shape change across all birds. We tested a hypothesis of allometric patterns of egg morphometric traits (radii of blunt end (infundibular zone, ri), pointed end (cloacal zone, rc), lateral zone (rl) and maximum diameter (D)) scaling against egg length (L). Phylogenetic allometric analysis was applied. We also studied hierarchical distribution of variation in egg traits at different taxonomic levels in order to determine the degree of egg shape variability on each of them. We revealed allometric patterns in the scaling of egg traits: D and ri scaled against L with negative allometry, while rc and rl were positively allometric. A high degree of covariation was observed between the length and diameter, radii of the lateral and infundibular zones, i.e. traits that are associated with the overall size of an egg, the degree of its elongation, and the shape of infundibular zone. Evolutionary correlation between L and rc was rather low. The greatest variation of egg traits resided at the level of orders. The identified general trends in egg shape variation are realized on the basis of various groups of birds in phylogenetic and ecological sense that assume the influence of these factors on the bird's egg shape.
摘要尽管鸟类的蛋形存在巨大的多样性,但相似的蛋形出现在栖息地不同且在系统发育上不密切的物种中;这表明存在限制蛋形变异性的因素。我们假设其中一个因素是所有鸟类蛋形变化的一般模式。我们检验了卵子形态计量特征(钝端半径(漏斗区,ri)、尖端半径(泄殖腔区,rc)、侧带半径(rl)和最大直径(D))相对于卵子长度(L)的异速计量模式。应用系统发育异速分析。我们还研究了不同分类水平上鸡蛋性状变异的层次分布,以确定每个性状的鸡蛋形状变异程度。我们揭示了卵子性状缩放的异速性模式:D和ri相对于L缩放为负异速性,而rc和rl为正异速性。在长度和直径、侧面和漏斗区的半径之间观察到高度的协变量,即与鸡蛋的总体大小、伸长程度和漏斗区形状相关的性状。L和rc之间的进化相关性相当低。鸡蛋性状的最大变异存在于订单水平上。蛋形变化的总体趋势是在系统发育和生态学意义上的各种鸟类群体的基础上实现的,这些群体假设这些因素对鸟的蛋形的影响。
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引用次数: 1
Diet Variation of a Generalist Predator, the American Kestrel Falco sparverius, in a Gradient of Agricultural Intensification in Central Argentina 阿根廷中部农业集约化梯度下普通捕食者美国红隼的日粮变化
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-08-20 DOI: 10.3161/00016454AO2021.56.1.008
Paula M. Orozco-Valor, J. Grande
Abstract. Agricultural expansion at the expense of natural habitats and the intensification processes in agricultural production are globally among the main causes of biodiversity and ecosystem services loss at large scale. This process can completely alter food provision for birds and have negative consequences for their diet and breeding performance. Under the hypothesis that changes in land use limit food resources for raptors, our aim was to analyze variation in nestling diet between natural areas and areas with different degrees of agricultural intensification (natural forest, traditional farmland, intensive farmland) in a population of American Kestrel Falco sparverius breeding in nest boxes and cavities. Through the analysis of pellets and prey remains collected during the reproductive season of 2012–2013 we found no differences in diet diversity among areas and the diet in the three areas was monopolized by arthropods. However, the diet did change in composition between areas. Numerically, Orthoptera dominated the diet in the three areas, although with a higher percentage in the forest area. The frequency of vertebrate consumption was affected positively by the area occupied by natural forest and stubble, while the soybean cover affected the consumption in a negative way. In both agricultural areas, the diet was complemented with different groups of arthropods suggesting that changes in land use generate a functional response in the American Kestrel that is able to take advantage of available resources in each sampling area. Long-term analysis of diet variation within the framework of agricultural intensification and its relation with demographic parameters and individual performance will allow to evaluate the impact of this variation in the diet on kestrels.
摘要以牺牲自然栖息地为代价的农业扩张和农业生产的集约化进程是全球范围内生物多样性和生态系统服务大规模丧失的主要原因。这一过程会完全改变鸟类的食物供应,并对它们的饮食和繁殖性能产生负面影响。在土地利用变化限制猛禽食物资源的假设下,我们的目的是分析在巢箱和洞穴中繁殖的美国Kestrel Falco sparverius种群中自然区域和不同农业集约化程度区域(天然林、传统农田、集约农田)之间巢食的变化。通过对2012-2013年繁殖季节收集的颗粒和猎物遗骸的分析,我们发现不同地区的饮食多样性没有差异,三个地区的饮食由节肢动物垄断。然而,不同地区的饮食成分确实发生了变化。从数字上看,直翅目在这三个地区的饮食中占主导地位,尽管在森林地区的比例更高。脊椎动物的消费频率受到天然林和残茬面积的正向影响,而大豆覆盖对消费的影响是负向的。在这两个农业区,不同的节肢动物群补充了饮食,这表明土地利用的变化会在美国红隼身上产生功能反应,从而能够利用每个采样区的可用资源。在农业集约化框架内对饮食变化及其与人口统计学参数和个体表现的关系进行长期分析,将有助于评估饮食变化对红隼的影响。
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引用次数: 2
Testosterone Increase in Free-Living Young Blackcaps Sylvia atricapilla and Wood Warblers Phylloscopus sibilatrix During Post-Juvenile Molt with Possible Implications for Juvenile Dispersal 幼年后蜕皮过程中自由生活的小黑帽Sylvia atricapilla和Wood Warblers Phylloscopus sibilatrix的睾酮增加可能对幼年分散有影响
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.002
M. Goretskaia, Eldar Rakhimberdiev, S. Naidenko, V. Moskalenko, E. Veselovskaya, V. Gavrilov, E. Vostretsova, I. Beme
Abstract. Testosterone may affect many aspects of passerine maturation including the expression of plumage coloration and spring migration in adult birds. However, how the testosterone level changes during bird development is not well known. We compared the testosterone profile during juvenile development of a sexually dimorphic species, the Blackcap Sylvia atricapilla, and a monomorphic species, the Wood Warbler Phylloscopus sibilatrix. We first tested whether testosterone influences plumage coloration and increases at the onset of molt in males of the dimorphic but not the monomorphic species. We found that a testosterone level increase occurred in both sexes and species during later stages of molt, and thus was not related to male plumage coloration. We also investigated whether the increase in testosterone level coincides with juvenile dispersal. If testosterone affects dispersal behavior in these species, both sexes should show an elevated testosterone level during dispersal, but this increase should occur earlier in the Wood Warbler, which disperses earlier than the Blackcap. In juvenile Blackcaps, the increase in testosterone level occurred on the 43–68th day after hatching, while in Wood Warblers it occurred on the 32–36th day (i.e. 11–32 days earlier). The increase in testosterone level coincided with the onset of the post-juvenile dispersal in both species. This study provides the first direct evidence of a testosterone level increase during juvenile development in two free-living migratory birds. While not correlated with species plumage coloration, this increase might affect other aspects of behavior, e.g. juvenile dispersal.
摘要睾酮可能影响雀形目成熟的许多方面,包括成年鸟类羽毛颜色的表达和春季迁徙。然而,鸟类发育过程中睾酮水平的变化尚不清楚。我们比较了性二型物种黑冠Sylvia atricapilla和单型物种Wood Warbler Phylloscopus sibilatrix在幼年发育过程中的睾酮水平。我们首先测试了睾酮是否会影响二形态而非单形态物种雄性的羽毛颜色,并在蜕皮开始时增加。我们发现,在蜕皮的后期,性别和物种的睾酮水平都会增加,因此与雄性羽毛的颜色无关。我们还调查了睾酮水平的增加是否与青少年的扩散相一致。如果睾酮影响这些物种的传播行为,那么在传播过程中,两性的睾酮水平都应该升高,但这种增加应该发生在比黑帽莺更早传播的木莺身上。在幼年黑帽鹬中,睾酮水平的增加发生在孵化后的第43–68天,而在Wood Warblers中,则发生在第32–36天(即提前11–32天)。睾酮水平的增加与这两个物种幼年后扩散的开始相吻合。这项研究首次提供了两种自由生活候鸟在幼年发育过程中睾酮水平升高的直接证据。虽然与物种的羽毛颜色无关,但这种增加可能会影响行为的其他方面,例如幼年的传播。
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引用次数: 0
Insulation of Common Chaffinch Fringilla coelebs Nests is Largely Driven by Animal-Derived Materials in the Cup Lining 普通鳕鱼巢的隔热主要是由杯内衬中的动物来源材料驱动的
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.010
D. Deeming, Eve Humphreys
Abstract. Incubation of eggs and nestlings is energetically costly and may be affected by the amount of thermal insulation the surrounding nest provides. In many small passerine species, animal-derived materials, i.e., feathers and hair, are often used in the nest lining where, presumably, their lower thermal conductance offers better insulation. A previous study that involved partial deconstruction of thrush nests revealed that different parts of the nest confer different levels of insulation. The present study examined the insulatory values of Common Chaffinch Fringilla coelebs nests because of the high proportion of animal-derived materials in their cup lining but not the outer nest. Insulatory values and cooling rates of temperature loggers inside the cup were determined for whole nests and then only the cup lining. There were no significant relationships between nest measurements and measures of thermal insulation. However, removal of the outer nest wall reduced the insulatory value by around 10% despite the cup lining being less than half the thickness of the complete nest wall and the cup lining being only a third of the total nest mass. Differential placement of animal-derived materials within the cup lining of Common Chaffinch nests means that the birds seem to be able to confer a high level of insulation without expending too much energy searching for a large mass of particular nest materials.
摘要孵化蛋和雏鸟在能量上是昂贵的,并且可能受到周围巢穴提供的隔热量的影响。在许多小型雀形目物种中,动物来源的材料,即羽毛和毛发,通常用于巢衬,据推测,它们较低的热导率提供了更好的隔热效果。之前的一项研究对画眉鸟巢穴进行了部分解构,结果表明,巢穴的不同部分具有不同的隔热水平。本研究考察了普通Chaffinch Fringilla coelebs巢穴的隔热价值,因为它们的杯状内衬中动物来源的材料比例很高,但外部巢穴中没有。确定了整个巢和仅杯衬的杯内温度记录器的绝缘值和冷却率。巢穴测量和隔热措施之间没有显著的关系。然而,尽管杯形衬里小于整个巢壁厚度的一半,并且杯形衬里仅为总巢质量的三分之一,移除外部巢壁将绝缘值降低了约10%。将动物来源的材料不同地放置在普通Chaffinch巢穴的杯状内衬中,这意味着鸟类似乎能够提供高水平的绝缘,而不会花费太多精力寻找大量特定的巢穴材料。
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引用次数: 6
Foraging Habitat Preferences of a Selective Herbivorous Bird, the Puna Rhea Rhea tarapacencis in the Desert Puna, Midwestern Argentina 阿根廷中西部普纳沙漠中一种选择性草食鸟类Puna Rhea taraparencis的觅食栖息地偏好
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.003
N. V. Marinero, J. L. Navarro, M. Martella
Abstract. In herbivores, habitat preference is influenced by resource availability, which is most evident in desert ecosystems. The desert puna is a South American environment dominated by grassy steppes with local grassy cushion plants associated with moist soil conditions, which form the habitat called ‘vegas'. In this environment, Puna Rhea Rhea tarapacencis has a strongly selective foraging strategy towards plant species that are in low abundance but that exhibit low contents of secondary compounds, fiber, or both. This contrasts with other generalist herbivores of arid environments, which prefer plant species with high fiber content and are highly abundant. We determined habitat use by Rheas in three habitat types: foothills, valley and vegas; and provided evidence of their feeding habitat preferences. From 2011 to 2014, we estimated density of birds and environmental variables such as total plant cover and abundance of total food, preferred foods and non-preferred foods. In particular, the density was estimated indirectly based on counting and collecting feces of the birds in transects. We analyzed the effect of the habitat type and environment variables on bird density; and compared the environmental variables among habitats. Puna Rheas used the three habitats, but fecal records were very scarce in vegas. The density was higher in foothills than in the valley (0.45 and 0.01 inds/km2, respectively), increased with higher abundance of the preferred foods and declined with increased non-preferred foods. The foothills were preferred as they had the highest abundance of the preferred foods and the non-preferred foods were similarly abundant in foothills and valley. The vegas had the highest total plant cover and the lowest abundance of all food species consumed by the Rheas. Therefore, the abundance of preferred foods, which have the best nutritional quality, represents a good predictor of habitat preference and, possibly, an essential resource during the life cycle of the Puna Rhea.
摘要在食草动物中,栖息地偏好受到资源可用性的影响,这在沙漠生态系统中最为明显。沙漠puna是南美洲的一个环境,主要是长满草的草原,当地的草垫植物与潮湿的土壤条件有关,形成了被称为“vegas”的栖息地。在这种环境中,恒河猴对丰度低但次生化合物、纤维含量低或两者兼有的植物物种有强烈的选择性觅食策略。这与干旱环境中的其他多面手草食动物形成了鲜明对比,后者更喜欢纤维含量高、含量高的植物物种。我们确定了Rheas在三种栖息地类型中的栖息地使用:山麓、山谷和维加斯;并提供了它们觅食栖息地偏好的证据。从2011年到2014年,我们估计了鸟类的密度和环境变量,如植物总覆盖率和总食物、首选食物和非首选食物的丰度。特别是,密度是根据样带中鸟类粪便的计数和收集间接估计的。我们分析了栖息地类型和环境变量对鸟类密度的影响;并比较了不同生境的环境变量。Puna Rheas使用了这三个栖息地,但素食主义者的粪便记录非常稀少。山麓地区的密度高于山谷(分别为0.45和0.01 inds/km2),随着首选食物的丰度增加而增加,随着非首选食物的增加而下降。山麓是首选食物,因为它们的首选食物丰度最高,而非首选食物在山麓和山谷中也同样丰富。在Rheas食用的所有食物中,纯素食者的植物总覆盖率最高,丰度最低。因此,丰富的首选食物具有最佳的营养质量,这是对栖息地偏好的一个很好的预测,可能也是Puna Rhea生命周期中的一种重要资源。
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引用次数: 0
Flight Performance of Migrating Juvenile Barn Swallows Hirundo rustica in Relation to Fat Load and Wing Morphology 迁徙小燕飞行性能与脂肪负荷和翅膀形态的关系
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.004
P. Matyjasiak, G. Bazzi, D. Rubolini
Abstract. Migratory birds have evolved the ability to accumulate fat reserves to fuel their migratory journeys. However, increased fuel load leads to an increased body mass, which is expected to impair flight performance and increase predation risk. Results of previous research are contradictory, with some studies reporting detrimental effects of fat load on flight performance, while others showing no such influences. Furthermore, no studies have investigated the relationship between fat load and flight performance in obligate aerial insectivores, which are known to accumulate only moderate fat loads while migrating overland and not crossing wide ecological barriers such as oceans or deserts. In this study we investigated the inter-individual variation in short-term flight performance (flight manoeuvrability, velocity and acceleration) in juvenile Barn Swallows Hirundo rustica in relation to fat load in Poland (central Europe), during the initial stages of autumn southward migration. We evaluated individual swallow fat loads by means of a Total Body Electrical Conductivity (TOBEC) scanner. In order to evaluate short-term flight performance in a standardised manner we used flight tunnels. We controlled statistically for the independent effect of wing morphology, which can be expected to influence flight performance. Juvenile fat loads were on average 7.5% (range 0.2–20.5) of lean body mass, but we found no negative effect of the fat mass on short-term flight performance traits. Individuals with larger fat mass reached higher velocity compared to leaner ones, which is in line with theoretical expectations. However, fat mass did not significantly predict flight manoeuvrability or acceleration. The results indicate that relatively small fat loads accumulated by juvenile Barn Swallows during overland migration do not impair short-term flight performance.
摘要候鸟已经进化出积累脂肪储备的能力,为它们的迁徙之旅提供燃料。然而,燃料负荷的增加会导致体重增加,预计这会损害飞行性能并增加捕食风险。先前的研究结果是矛盾的,一些研究报告了脂肪负荷对飞行性能的有害影响,而另一些研究则没有显示出这种影响。此外,还没有研究调查专性航空食虫动物的脂肪负荷与飞行性能之间的关系,已知专性航空食虫动物在陆上迁徙时仅积累中等脂肪负荷,而不跨越海洋或沙漠等广泛的生态屏障。在这项研究中,我们调查了波兰(中欧)秋季南迁初期,幼年Barn Swallows Hirundo rustica的短期飞行性能(飞行机动性、速度和加速度)与脂肪负荷的个体间变化。我们通过全身电导率(TOBEC)扫描仪评估了个体吞咽脂肪负荷。为了以标准化的方式评估短期飞行性能,我们使用了飞行隧道。我们对机翼形态的独立影响进行了统计控制,预计机翼形态会影响飞行性能。青少年脂肪负荷平均为瘦体重的7.5%(范围为0.2-20.5),但我们没有发现脂肪量对短期飞行性能特征的负面影响。与苗条的人相比,脂肪量较大的人达到了更高的速度,这符合理论预期。然而,脂肪质量并不能显著预测飞行操纵性或加速度。结果表明,幼年仓燕在陆上迁徙过程中积累的相对较小的脂肪负荷不会影响短期飞行性能。
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引用次数: 1
Nest Site Selection Along Forest-Streams by Two Forest-Dwelling Neotropical Passerines 两种生活在森林中的新热带雀形目动物在森林溪流中的巢址选择
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.005
D. F. Perrella, P. Zima, M. Francisco
Abstract. In tropical forests many forest-dwelling non-aquatic passerines build nests by forest streams. It has been proposed that this behavior protects the nest from predators. However, this hypothesis has been rarely tested, and relevant aspects of the relationships between nesting birds and forest streams are to be studied. Firstly, it is not clear whether tropical forest understory passerines can indeed select stream banks for nest construction, as researchers often use forest streams as pathways, which could cause the false impression that nests of certain species are more frequently found near water. Secondly, it is expected that if birds select stream banks for nest construction, they will choose nest spots with characteristics that could increase nest survival. We studied nest site selection in two Atlantic Forest birds: the Blue Manakin Chiroxiphia caudata and the Star-throated Antwren Rhopias gularis. Nests were searched near and far from water, and a number of stream characteristics, including width, depth, water speed and water sound were compared between nest sites and random sites chosen upstream or downstream. Finally, we addressed whether stream variables could explain nest daily survival rate (DSR). Nests of both species were found only near or over water, and the average DSR was 0.975 for the Blue Manakin and 0.972 for the Star-throated Antwren. Our results provided support for the "aqua-phobic nest predator hypothesis", since we found a positive correlation between DSR and stream depth for the Star-throated Antwren and a negative correlation between nest distance from water and DSR for the Blue Manakin. However, stream parameters were not among the main variables explaining nest site selection along streams. This suggests that partial isolation provided by forest streams may reduce nest predation and can drive these species to use stream banks for nesting. The main predators of Blue Manakin nests were birds (80% of filmed predation events), whereas nests of Star-throated Antwren were preyed upon mostly by mammals (54.5% of the records).
摘要在热带森林中,许多栖息在森林中的非水生雀形目动物在森林溪流旁筑巢。有人提出,这种行为可以保护巢穴免受捕食者的侵害。然而,这一假设很少得到验证,筑巢鸟类和森林溪流之间关系的相关方面有待研究。首先,尚不清楚热带森林林下的雀形目雀形目是否真的可以选择河岸筑巢,因为研究人员经常将森林溪流作为路径,这可能会造成某些物种的巢穴更经常在水附近发现的错误印象。其次,预计鸟类在选择河岸筑巢时,会选择具有提高筑巢成活率特征的筑巢点。本文研究了两种大西洋森林鸟类的巢址选择:蓝金丝鸟Chiroxiphia caudata和星喉蚁Rhopias gularis。研究人员在靠近水和远离水的地方搜索了鸟巢,并比较了鸟巢地点和随机选择的上游或下游地点之间的许多溪流特征,包括宽度、深度、水流速度和水声。最后,我们讨论了流变量是否可以解释巢的日存活率(DSR)。两种鸟的巢均分布在水面附近,平均DSR分别为0.975和0.972。我们的研究结果为“恐水巢捕食者假说”提供了支持,因为我们发现星喉蚁的DSR与溪流深度呈正相关,而蓝喉蚁的巢距与水的DSR呈负相关。然而,溪流参数并不是解释沿溪流筑巢地点选择的主要变量。这表明森林溪流提供的部分隔离可能会减少巢穴捕食,并可以驱使这些物种使用河岸筑巢。蓝喉蚁巢的主要捕食者是鸟类(80%的记录捕食事件),而星喉蚁巢主要被哺乳动物捕食(54.5%的记录)。
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引用次数: 2
Citizen Science to Assess the Fine-Grain Distribution and Habitat Use of the Middle Spotted Woodpecker Dendrocoptes medius 公民科学评估中斑啄木鸟的细粒分布和栖息地利用
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.011
José M. Fernández-García, H. Robles
Abstract. Citizen science (i.e. monitoring or research schemes with volunteer participation in data collection) is becoming an increasingly used tool that may yield reliable estimates of species distribution ranges. In 2017 and 2018, we assessed the fine-grain distribution and habitat use of the Middle Spotted Woodpecker in the Basque Country (N Spain) by combining two citizen science approaches: opportunistic observations gathered from internet collaborative databases, and standardised records collected by volunteers trained with a species-specific fieldwork protocol. Six out of the thirty-four opportunistic observations were located out of previously known distribution ranges. Because the reliability of those observations was difficult to assess, opportunistic observations should be validated to avoid false positives. As for the species-specific approach, Middle Spotted Woodpecker occurrence was examined by conducting itineraries with point counts and audio-stimulation, sampled twice during the pre-breeding season, in 95 UTM units of 1 km2. Woodpeckers were recorded in 29 of those units. In combination with recent species-specific studies, our results show that Middle Spotted Woodpeckers occurred mainly in a core, continuous range (69 positive units in and around the Izki forest) and in two smaller ranges (6 units in Montes de Vitoria and 5 units in Sierra de Entzia). Out of previously known distribution ranges, the species-specific approach showed that woodpecker occurrence was negatively affected by the distance to the core Izki forest and, to a lesser extent, positively influenced by the tree basal area of the forest stand. While the species-specific fieldwork approach allowed to improve the delineation of distribution ranges and the assessment of habitat use, the opportunistic approach pointed out to overlooked ranges but showed limited efficacy to assess the fine-grain distribution of the Middle Spotted Woodpecker.
摘要公民科学(即由志愿者参与数据收集的监测或研究计划)正在成为一种越来越常用的工具,它可能产生可靠的物种分布范围估计。在2017年和2018年,我们通过结合两种公民科学方法,评估了巴斯克地区(西班牙北部)中斑啄木鸟的细粒分布和栖息地使用情况:从互联网协作数据库收集的机会主义观察,以及经过特定物种实地调查协议培训的志愿者收集的标准化记录。在34个机会性观测中,有6个位于先前已知的分布范围之外。由于这些观察结果的可靠性难以评估,因此应该对机会性观察结果进行验证,以避免误报。在1 km2的95个UTM单元内,采用点位计数和音频刺激的方法对中斑啄木鸟的发生情况进行了调查。其中29个单位有啄木鸟的记录。结合最近的物种特异性研究,我们的结果表明,中斑啄木鸟主要发生在一个核心的连续范围内(Izki森林及其周围有69个单位)和两个较小的范围内(Montes de Vitoria 6个单位和Sierra de Entzia 5个单位)。在以前已知的分布范围中,物种特异性方法表明,啄木鸟的发生受距离核心伊兹基林的距离的负面影响,在较小程度上受林分树基面积的积极影响。特定种野外调查方法可以改善中斑啄木鸟分布范围的划定和栖息地利用的评估,而机会主义方法指出了被忽视的范围,但对评估中斑啄木鸟的细粒分布效果有限。
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引用次数: 2
Does the Breeding Biology of the Eurasian Stone-Curlew Burhinus oedicnemus in South-Western Morocco Differ between Grazed Steppe and Irrigated Farmland? 摩洛哥西南部放牧草原与灌溉农田欧亚石鸻的繁殖生物学差异?
IF 0.7 4区 生物学 Q3 ORNITHOLOGY Pub Date : 2021-03-19 DOI: 10.3161/00016454AO2020.55.2.007
Yassine Teyar, D. Giunchi, M. Baratti, V. Falchi, M. Znari, M. Aourir
Abstract. Birds associated with steppe and pseudosteppe habitats are one of the most threatened avian communities in Europe, given their recent decline due to agriculture intensification and land abandonment. Large-scale conversion of natural and rural areas into irrigated farmlands is ongoing in North Africa, but the effects of this habitat modification on steppe bird species are not investigated. In this study, we investigated the breeding biology of the Eurasian Stone-curlew nesting in grazed steppes and irrigated farmlands in south-western Morocco. Breeding data were collected during 2017 and 2018 breeding seasons on 59 nests. Egg volume was significantly higher in grazed steppes than in irrigated farmlands (37.3 ± 2.30 cm3 vs 35.1 ± 2.11 cm3, average ± SD), possibly due to greater food availability in the former habitat. On the other hand, daily nest survival over the incubation period did not differ between habitats and it was quite high (0.85 [95% CI: 0.71–0.93]) also when compared to the data available for other regions. These results suggest that birds nesting in protected areas characterized by traditional pastoralism might find better conditions for reproduction which allow them to lay larger eggs. In addition, the ongoing process of agricultural intensification in the area does not seem to affect the likelihood of nest failure. Our data add to the few available pieces of evidence regarding the effect of breeding habitat on the reproductive biology of the Stone-curlew in the southern range of its distribution. Further data are needed in order to understand the conservation implication of our findings and, in particular, how the observed variability of egg size might affect chick quality and survival.
摘要由于农业集约化和土地遗弃,与草原和伪草原栖息地有关的鸟类是欧洲最受威胁的鸟类群落之一。北非正在大规模地将自然和农村地区转变为灌溉农田,但这种栖息地改变对草原鸟类物种的影响尚未调查。本研究对摩洛哥西南部放牧草原和灌溉农田中欧亚石鸻的繁殖生物学进行了研究。在2017年和2018年的繁殖季节,收集了59个巢穴的繁殖数据。放牧草原的鸡蛋体积显著高于灌溉农田(37.3±2.30 cm3 vs 35.1±2.11 cm3,平均±SD),这可能是由于放牧草原的食物供应更充足。另一方面,与其他地区的数据相比,不同栖息地之间孵化期间的每日巢存活率没有差异,而且相当高(0.85 [95% CI: 0.71-0.93])。这些结果表明,在以传统畜牧业为特征的保护区筑巢的鸟类可能会找到更好的繁殖条件,使它们能够产下更大的蛋。此外,该地区正在进行的农业集约化进程似乎并不影响巢衰竭的可能性。我们的数据增加了少数可用的证据,关于繁殖栖息地对石鸻在其分布的南部范围内的生殖生物学的影响。需要进一步的数据来理解我们的研究结果的保护意义,特别是观察到的鸡蛋大小的变化如何影响小鸡的质量和存活率。
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引用次数: 0
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Acta Ornithologica
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